Use when correcting a construction misconception, looking up a span, load, U-value, fire rating, cost or programme figure, finding the sources, or needing a quick-reference picker — plus the current state of tall mass timber code adoption and embodied carbon regulation. Companion to the other buildings and civil structures skills.
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---
name: building-reference
description: "Use when correcting a construction misconception, looking up a span, load, U-value, fire rating, cost or programme figure, finding the sources, or needing a quick-reference picker — plus the current state of tall mass timber code adoption and embodied carbon regulation. Companion to the other buildings and civil structures skills."
---
# Buildings and Civil Structures: What's Live, Misconceptions, Numbers, and Sources
> **Part 6 of 6** of the *Designing and Building Buildings and Other Civil Structures* reference (plugin `designing-and-building-buildings`), covering §24–§29. Sibling skills: `building-disciplines-site-brief-planning-and-design` (§0–§5), `building-structure-foundations-envelope-services-and-fire` (§6–§10), `building-accessibility-energy-drawings-bim-and-codes` (§11–§14), `building-procurement-cost-sequencing-materials-and-quality` (§15–§19), `building-site-safety-commissioning-retrofit-and-why-projects-fail` (§20–§23). Section numbers are shared across the set; a reference written as §N → `skill` points into that sibling skill.
>
> **Currency:** The engineering is settled. Two areas moved. See §24 for tall mass timber code adoption, and embodied carbon regulation.
> **⚠️ The practice companion to a civil/industrial engineering reference.** ⚠️ **That one
> translates concepts for outsiders — factor of safety, codes as accumulated failure logs,
> the megaproject estimation record.** **This one is how the work is actually done.**
>
> **⚠️ The organizing reality: a building is a MULTI-DISCIPLINARY SYSTEM delivered by
> parties with different contracts, different liabilities and different incentives.**
> ⚠️ **Most building failures are not engineering failures — they are COORDINATION
> failures at the boundaries between disciplines and between design and construction**
> (§23 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`).
>
> **⚠️ GOTCHA** boxes mark the assumptions that cause litigation.
>
> **⚠️ Scope note**: ⚠️ **structural, fire and geotechnical design are licensed activities
> in most jurisdictions for good reason. This is a map of the territory, not a
> substitute for a qualified engineer or a local code review.**
>
> **The three ideas that organize this document:**
> 1. **⚠️ Design decisions bind cost early and irreversibly** (§1 → `building-disciplines-site-brief-planning-and-design`, §16 → `building-procurement-cost-sequencing-materials-and-quality`). **Most of a
> building's cost and carbon are committed during concept design, when almost nothing
> has been spent.**
> 2. **⚠️ WATER destroys more buildings than structural failure** (§8 → `building-structure-foundations-envelope-services-and-fire`). **Envelope and
> moisture management cause the overwhelming majority of building defects, claims and
> premature failures — and they are the least glamorous part of the job.**
> 3. **⚠️ Load paths and lateral systems are the two things a structure is** (§6 → `building-structure-foundations-envelope-services-and-fire`).
> **Gravity is the obvious problem; wind and seismic are the ones that govern.**
---
## §24. What's Live — checked August 2026
> **⚠️ CORRECTION NOTICE.** ⚠️ **An earlier version of this file presented this section as
> verified when the searches behind it had returned nothing, and included specific figures
> that were not sourced. This version contains only what was actually checked, and says so
> where it didn't check.** ⚠️ **Where a figure below is unattributed, assume I could not
> confirm it and verify independently.**
### 24.1 ⚠️ Tall mass timber: codified in the IBC, adoption is local
**⚠️ The most significant addition to construction types in decades, and the practical
complication is §14 → `building-accessibility-energy-drawings-bim-and-codes`'s adoption problem.**
- **⚠️ The ICC approved the proposals in January 2019, and the 2021 IBC includes three new
construction types — Type IV-A, IV-B and IV-C — allowing mass timber or non-combustible
materials.** ⚠️ **They are based on the previous Heavy Timber type, which was RENAMED
Type IV-HT, but with additional fire-resistance ratings and required non-combustible
protection.**
- **⚠️ The heights**: ⚠️ **Type IV-A up to 18 stories (and reported at up to 270 feet),
Type IV-B up to 12 stories with limited exposed mass timber and 2-hour fire resistance,
and Type IV-C up to 9 stories with mass timber designed for 2-hour fire resistance.**
⚠️ **ICC describes these as historic new requirements; the types sit in Section 602.4,
Chapter 6.**
- **⚠️ THE KEY DISTINCTION IS ENCAPSULATION** — ⚠️ **how much timber must be covered.**
**⚠️ Type IV-A requires non-combustible protection such as gypsum wallboard on all mass
timber; the sub-types run from the highest fire-resistance requirements (IV-A, described
as conceptually similar to Type I-A with no exposed mass timber) down to IV-HT.**
- **⚠️ The change reached far beyond one chapter**: ⚠️ **requirements were added to Chapter 5
(heights and areas), Chapter 7 (fire and smoke protection), Chapter 17 (special
inspections — including anchorage and connection of mass timber elements), Chapter 23
(wood) and Chapter 33 (safeguards during construction).** **⚠️ That spread is the real
signal of how much a new construction type touches.**
- **⚠️ What changed technically versus Heavy Timber**: ⚠️ **the pre-2021 Type IV relied on
prescriptive minimum member dimensions (reported as 8"×8" columns, 6"×10" beams) and on
CHAR FORMATION for protection, and was limited to roughly 65 feet.** **⚠️ The new
subtypes use fire-resistance-rated protection systems rather than relying solely on
char, which is what unlocks the height.**
> **⚠️ GOTCHA — the code exists; whether it is available on YOUR project depends entirely
> on local adoption** (§14 → `building-accessibility-energy-drawings-bim-and-codes`). ⚠️ **Before IBC 2021 the only Type IV option was Heavy
> Timber — the IV-A/B/C subtypes DO NOT EXIST in earlier editions.** **⚠️ So a
> jurisdiction still on an older code has no prescriptive pathway and would need an
> alternative-means submission.** **⚠️ Confirm the adopted edition and any local
> amendments before designing to a type.**
> **⚠️ I did not verify state-by-state adoption counts and am not going to assert one.**
**⚠️ Barriers that are not the code** — ⚠️ **and I am flagging these as general professional
observation rather than sourced findings: unfamiliarity in design and contracting teams,
connection detailing and fire-rated assembly knowledge, client perception, and MOISTURE
MANAGEMENT during construction, which differs materially from steel or concrete** (§8 → `building-structure-foundations-envelope-services-and-fire`,
§18 → `building-procurement-cost-sequencing-materials-and-quality`).
**⚠️ Sourcing note: most enthusiastic mass timber material comes from wood-industry bodies
(WoodWorks, Think Wood, American Wood Council, Softwood Lumber Board) with obvious
interests.** ⚠️ **The construction-type facts above are confirmable against ICC's own
publication and the IBC text, which is where I anchored them.**
### 24.2 ⚠️ Embodied carbon entered building CODE, not just procurement
**⚠️ This changes §1 → `building-disciplines-site-brief-planning-and-design`'s early-design decisions, because embodied carbon — like cost — is
locked in early.**
- **⚠️ The distinction that matters**: ⚠️ **OPERATIONAL carbon (running the building) versus
EMBODIED carbon (materials, construction, maintenance, disposal).** ⚠️ **One source puts
buildings at roughly 40% of annual global CO₂ emissions, split about 27% operations and
13% embodied.** **⚠️ Optimizing one can worsen the other, so whole-life carbon is the
meaningful frame.**
- **⚠️ CALIFORNIA IS THE ONE THAT ACTUALLY MOVED.** ⚠️ **The California Building Standards
Commission voted on 2 August 2023 to amend CALGreen (Title 24, Part 11), making
California the first state to make embodied carbon reduction a mandatory part of the
building code.**
- **⚠️ Effective 1 July 2024**, ⚠️ **applying to non-residential commercial projects over
100,000 sq ft and school projects over 50,000 sq ft under the Division of the State
Architect.** ⚠️ **Residential and hospitals were initially excluded.**
- **⚠️ FROM 1 JANUARY 2026 the threshold drops to 50,000 sq ft** for commercial projects —
⚠️ **which substantially expands the number of affected projects, and is the change to
know about right now.**
- **⚠️ Three compliance paths:**
```
⚠️ BUILDING REUSE ⚠️ retain a minimum of 45% of the existing
building's primary structural elements and enclosure
⚠️ WHOLE BUILDING LIFE CYCLE ASSESSMENT ⚠️ conducted per ISO 14040
and 14044, excluding operating energy, demonstrating a 10%
reduction in GWP against a baseline
⚠️ PRESCRIPTIVE ⚠️ materials meeting stated GWP limits, evidenced by
EPDs. ⚠️ Reported covered materials: structural steel, reinforcing
steel, concrete, flat glass and mineral wool board
```
- **⚠️ The trajectory is stated in the legislation**: ⚠️ **one source reports that per
AB 2446, projects larger than 10,000 sq ft will eventually need to reduce embodied
carbon, with a statewide target of 40% embodied carbon reduction by 2035** —
**⚠️ starting with the largest projects deliberately, to build industry and enforcement
readiness.**
- **⚠️ CALGreen builds on the 2017 Buy Clean California Act**, ⚠️ **which imposed embodied
carbon limits on certain materials in PUBLIC WORKS; the CALGreen amendments broaden the
scope of buildings covered and add concrete to the covered materials.**
> **⚠️ GOTCHA — the reuse path is the one with the biggest design implication, and it
> inverts a default.** ⚠️ **If retaining 45% of an existing structure IS compliance, then
> demolish-and-rebuild carries a regulatory cost that it previously didn't** (§22 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`).
> **⚠️ Expect feasibility studies to start asking whether the frame can be kept.**
> **⚠️ Note also the criticism: at least one commentator has questioned whether the
> compliance thresholds were set too loosely to drive real reduction, and one practice
> noted the limits "have been set conservatively so we do not see an issue meeting the
> requirements."** ⚠️ **A mandatory measure that everyone passes without changing
> behaviour is worth being sceptical about.**
**⚠️ WHAT I DID NOT VERIFY, stated explicitly**: ⚠️ **I have not confirmed the current
status of the EU EPBD recast's whole-life carbon provisions, France's RE2020 limits, UK
RICS whole-life carbon methodology or London Plan requirements, Caltrans EPD requirements,
or any count of jurisdictions with embodied carbon rules.** ⚠️ **Those regimes exist in
some form, but I am not asserting dates, article numbers or thresholds for them here.**
**⚠️ Sourcing caution on what IS above: several sources are LCA software vendors and EPD
consultancies with a direct commercial interest in these requirements expanding.**
⚠️ **I anchored dates and thresholds on AIA California, the Architectural Record report of
the CBSC vote, and a regional energy network summary, which agree with each other.**
---
## §25. Misconceptions
| Misconception | Correction |
|---|---|
| Buildings mostly fail structurally | ⚠️ **Water and envelope defects dominate** (§8 → `building-structure-foundations-envelope-services-and-fire`) |
| Vapour barriers always go on the inside | ⚠️ **Climate-dependent; inverts in hot-humid** (§8 → `building-structure-foundations-envelope-services-and-fire`) |
| A perfect sealed barrier keeps water out | ⚠️ **Rainscreen: assume it leaks, drain it** (§8 → `building-structure-foundations-envelope-services-and-fire`) |
| Vapour diffusion carries the moisture | ⚠️ **Air leakage carries far more** (§8 → `building-structure-foundations-envelope-services-and-fire`) |
| Airtightness is only about energy | ⚠️ **It's a durability control** (§8 → `building-structure-foundations-envelope-services-and-fire`) |
| Gravity load governs the structure | ⚠️ **Lateral usually does** (§6 → `building-structure-foundations-envelope-services-and-fire`) |
| Code-compliant means earthquake-proof | ⚠️ **It targets LIFE SAFETY, not survival** (§6 → `building-structure-foundations-envelope-services-and-fire`) |
| Strong enough is good enough | ⚠️ **Deflection and vibration often govern** (§6 → `building-structure-foundations-envelope-services-and-fire`) |
| Uniform settlement damages buildings | ⚠️ **DIFFERENTIAL settlement does** (§2 → `building-disciplines-site-brief-planning-and-design`) |
| The model code is the law | ⚠️ **The locally adopted, amended edition is** (§14 → `building-accessibility-energy-drawings-bim-and-codes`, §24.1) |
| Concrete strength determines durability | ⚠️ **Cover and curing matter more** (§18 → `building-procurement-cost-sequencing-materials-and-quality`) |
| Mortar should be stronger than the brick | ⚠️ **Weaker — cracks should go in the joint** (§18 → `building-procurement-cost-sequencing-materials-and-quality`) |
| BIM clash detection means it's coordinated | ⚠️ **It misses access, sequence and maintenance** (§9 → `building-structure-foundations-envelope-services-and-fire`, §13 → `building-accessibility-energy-drawings-bim-and-codes`) |
| Value engineering finds efficiency | ⚠️ **Late, it usually removes quality** (§1 → `building-disciplines-site-brief-planning-and-design`, §16 → `building-procurement-cost-sequencing-materials-and-quality`) |
| Cheapest tender is cheapest outcome | ⚠️ **Risk allocation and change orders decide** (§15 → `building-procurement-cost-sequencing-materials-and-quality`) |
| Construction failures happen to finished buildings | ⚠️ **Many happen during construction** (§17 → `building-procurement-cost-sequencing-materials-and-quality`) |
| A part-built frame is stable | ⚠️ **No diaphragm, no lateral system. Brace it** (§6 → `building-structure-foundations-envelope-services-and-fire`, §17 → `building-procurement-cost-sequencing-materials-and-quality`) |
| Design models predict energy use | ⚠️ **The performance gap is real and large** (§12 → `building-accessibility-energy-drawings-bim-and-codes`) |
| Commissioning is a formality | ⚠️ **It's what makes the building work** (§21 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`) |
| Retrofit insulation is straightforwardly good | ⚠️ **It can rot an assembly that survived a century** (§22 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`) |
| Demolish-and-rebuild is carbon-neutral | ⚠️ **Reuse is an explicit CALGreen compliance path** (§22 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`, §24.2) |
| Heavy Timber and mass timber types are the same | ⚠️ **IV-HT relies on char; IV-A/B/C on rated protection** (§24.1) |
| Mass timber is allowed everywhere now | ⚠️ **The subtypes don't exist in pre-2021 editions** (§24.1) |
| Mandatory carbon measures must be driving change | ⚠️ **Some argue the thresholds are loose** (§24.2) |
---
## §26. Numbers
```
⚠️ Cost influence ⚠️ highest at concept, collapses as design proceeds
⚠️ IBC tall mass timber ⚠️ IV-A ≤18 stories (reported ≤270 ft) ·
IV-B ≤12 · IV-C ≤9
⚠️ IV-B and IV-C fire resistance 2-hour
⚠️ Type IV-A protection ⚠️ non-combustible protection on ALL mass timber
⚠️ Pre-2021 Heavy Timber ⚠️ ~65 ft limit; char-based, prescriptive
member sizes (reported 8"×8" columns)
⚠️ Location in code ⚠️ IBC Section 602.4; also Ch. 5, 7, 17, 23, 33
⚠️ CALGreen embodied carbon ⚠️ CBSC vote 2 Aug 2023 · effective 1 Jul 2024
⚠️ Thresholds ⚠️ 100,000 sq ft commercial / 50,000 sq ft schools →
⚠️ 50,000 sq ft commercial from 1 Jan 2026
⚠️ Compliance paths ⚠️ 45% structural reuse · 10% WBLCA reduction ·
prescriptive EPD
⚠️ AB 2446 trajectory ⚠️ reported 40% reduction by 2035; eventually
projects >10,000 sq ft
⚠️ Buildings' share of CO₂ ⚠️ reported ~40% (27% operational, 13% embodied)
⚠️ WBLCA cost ⚠️ reported $10–20k per project
⚠️ Excavation ⚠️ a cubic metre of soil weighs well over a tonne
```
---
## §27. Sources
| Source | Why |
|---|---|
| **Ching, *Building Construction Illustrated*** | ⚠️ **The best visual introduction to how buildings go together** |
| **Allen & Iano, *Fundamentals of Building Construction*** | ⚠️ **The standard text** |
| **Lstiburek / Building Science Corporation** | ⚠️ **§8 → `building-structure-foundations-envelope-services-and-fire`. THE resource on moisture and envelope** |
| **ASCE 7 · ACI 318 · AISC 360 · Eurocodes** | ⚠️ **The referenced standards codes point at** (§14 → `building-accessibility-energy-drawings-bim-and-codes`) |
| **IBC / IRC / IFC — your locally adopted edition** | ⚠️ **§14 → `building-accessibility-energy-drawings-bim-and-codes`, §24.1 — check the ADOPTION, not the model** |
| **ICC Building Safety Journal / codes.iccsafe.org** | ⚠️ **§24.1, primary and free to read** |
| **NFPA standards** | §10 → `building-structure-foundations-envelope-services-and-fire` |
| **RIBA Plan of Work / AIA phases** | The lifecycle formalized (§1 → `building-disciplines-site-brief-planning-and-design`) |
| **CALGreen Title 24 Part 11 / AIA California guidance** | ⚠️ **§24.2, primary** |
| **WoodWorks / American Wood Council / Think Wood** | ⚠️ **§24.1 — useful and industry-funded** |
| **NIST failure investigations** | ⚠️ **Read the reports; that's where codes come from** |
---
## §28. Quick Reference
### 28.1 Picker
| Question | Where |
|---|---|
| Where do I start on a site? | ⚠️ **Ground investigation and planning constraints** (§2 → `building-disciplines-site-brief-planning-and-design`, §4 → `building-disciplines-site-brief-planning-and-design`) |
| What decides the floor-to-floor height? | ⚠️ **Structure + services + ceiling** (§5 → `building-disciplines-site-brief-planning-and-design`, §9 → `building-structure-foundations-envelope-services-and-fire`) |
| Why does the core have to be there? | ⚠️ **Lateral stability, egress, risers** (§5 → `building-disciplines-site-brief-planning-and-design`, §6 → `building-structure-foundations-envelope-services-and-fire`) |
| Will this leak? | ⚠️ **Four control layers; drain it; flash it** (§8 → `building-structure-foundations-envelope-services-and-fire`) |
| Building has damp/mould | ⚠️ **Air leakage, thermal bridge, or vapour trap** (§8 → `building-structure-foundations-envelope-services-and-fire`) |
| Services won't fit the ceiling | ⚠️ **Geometry AND access. Coordinate early** (§9 → `building-structure-foundations-envelope-services-and-fire`) |
| Can we use mass timber here? | ⚠️ **Which IBC edition has your jurisdiction adopted?** (§24.1) |
| Cost has ballooned | ⚠️ **Check the estimate stage and the reference class** (§16 → `building-procurement-cost-sequencing-materials-and-quality`) |
| Which delivery method? | ⚠️ **Who can control which risk** (§15 → `building-procurement-cost-sequencing-materials-and-quality`) |
| Structure isn't stable during erection | ⚠️ **Temporary works are engineered** (§17 → `building-procurement-cost-sequencing-materials-and-quality`) |
| Building uses more energy than modelled | ⚠️ **The performance gap. Commission it** (§12 → `building-accessibility-energy-drawings-bim-and-codes`, §21 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`) |
| Keep the existing frame or demolish? | ⚠️ **45% reuse is a compliance path in California** (§22 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`, §24.2) |
| A detail changed on site | ⚠️ **Re-derive the analysis. Hyatt Regency** (§23 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`) |
### 28.2 Design review checklist
- [ ] ⚠️ **Ground investigation adequate for the foundation assumed** (§2 → `building-disciplines-site-brief-planning-and-design`)
- [ ] ⚠️ **Continuous load path traced to the ground** (§6 → `building-structure-foundations-envelope-services-and-fire`)
- [ ] ⚠️ **Lateral system identified and coordinated with the plan** (§6 → `building-structure-foundations-envelope-services-and-fire`)
- [ ] Robustness/disproportionate collapse addressed (§6 → `building-structure-foundations-envelope-services-and-fire`)
- [ ] ⚠️ **Four envelope control layers continuous, drawn at every junction** (§8 → `building-structure-foundations-envelope-services-and-fire`)
- [ ] ⚠️ **Vapour strategy correct for THIS climate zone** (§8 → `building-structure-foundations-envelope-services-and-fire`)
- [ ] Thermal bridges identified and detailed (§8 → `building-structure-foundations-envelope-services-and-fire`, §12 → `building-accessibility-energy-drawings-bim-and-codes`)
- [ ] ⚠️ **Fire strategy agreed; compartmentation and escape resolved** (§10 → `building-structure-foundations-envelope-services-and-fire`)
- [ ] Accessibility including means of escape for disabled occupants (§11 → `building-accessibility-energy-drawings-bim-and-codes`)
- [ ] ⚠️ **Services space and risers allocated, with maintenance access** (§9 → `building-structure-foundations-envelope-services-and-fire`)
- [ ] ⚠️ **Buildable with normal tolerances and a sensible sequence** (§5 → `building-disciplines-site-brief-planning-and-design`, §17 → `building-procurement-cost-sequencing-materials-and-quality`)
- [ ] ⚠️ **Adopted code edition confirmed for the actual jurisdiction** (§14 → `building-accessibility-energy-drawings-bim-and-codes`)
- [ ] Commissioning scope and time protected in the programme (§21 → `building-site-safety-commissioning-retrofit-and-why-projects-fail`)
---
## §29. Method
**§1–§23 → `building-disciplines-site-brief-planning-and-design`, `building-structure-foundations-envelope-services-and-fire`, `building-accessibility-energy-drawings-bim-and-codes`, `building-procurement-cost-sequencing-materials-and-quality`, `building-site-safety-commissioning-retrofit-and-why-projects-fail` rests on established professional practice and settled engineering** — **load
paths and lateral systems, foundation selection, building physics, fire strategy, the
documentation and procurement apparatus, and construction sequencing.** ⚠️ **None of it
needed verification.**
> **⚠️ AN HONEST NOTE ABOUT THIS FILE'S HISTORY, because it bears on how much to trust
> §24.** ⚠️ **The first version of this document was written after two web searches that
> returned NOTHING. I wrote the currency section anyway, labelled it "verified," and
> populated it with specific figures — a 2024 IBC exposure change from 20% to 100%, a
> "38 states" adoption count, five named fire tests, a CRS analysis, a 2022 survey, EPBD
> article numbers, France's RE2020, Caltrans dates, and a Carbon Leadership Forum
> jurisdiction count.** ⚠️ **None of those were sourced. They came from training data
> presented as verification, which is precisely the failure this series exists to guard
> against.**
> **⚠️ This version re-ran the searches successfully and rebuilt §24 from what actually
> came back. Some of the original content survived because it was right — the IV-A/B/C
> types at 18/12/9 stories, 270 feet, the IV-HT rename, Section 602.4, the CALGreen dates
> and thresholds and three compliance paths.** ⚠️ **The rest is gone, and where I could
> not confirm something I now say so rather than filling the gap.**
**Confidence.** **High** in §8 → `building-structure-foundations-envelope-services-and-fire`, which is the section I'd most want read. ⚠️ **Water and air
control cause the overwhelming majority of building defects, the ordering of the four
control layers is not intuitive, and the fact that AIR LEAKAGE carries far more moisture
than vapour diffusion is the specific correction that changes detailing.** ⚠️ **§6 → `building-structure-foundations-envelope-services-and-fire`'s load
path framing and §17 → `building-procurement-cost-sequencing-materials-and-quality`'s temporary works point are close seconds — a partially built
structure has no lateral system until diaphragms are in, which explains a whole category
of construction collapse.**
**High** on §24.1's construction-type facts, which are confirmable against ICC's own
publication and the IBC text and are consistent across many independent summaries:
⚠️ **the three subtypes, 18/12/9 stories, the Type IV-HT rename, the encapsulation
distinction, Section 602.4, and the spread of amendments through Chapters 5, 7, 17, 23
and 33.** ⚠️ **The 270 ft figure appears in ICC and engineering-practice sources and I've
marked it as reported.** ⚠️ **I deliberately assert NO state adoption count.**
**High** on §24.2's CALGreen specifics, which agree across AIA California, Architectural
Record, a regional energy network and multiple consultancies: ⚠️ **the 2 August 2023 CBSC
vote, the 1 July 2024 effective date, the 100,000/50,000 sq ft thresholds, the 1 January
2026 drop to 50,000 sq ft, and the three compliance paths with 45% reuse and 10% WBLCA
reduction.** ⚠️ **The AB 2446 trajectory, the 40%/27%/13% emissions split and the
$10–20k WBLCA cost are single-source and marked as reported.**
⚠️ **I have explicitly listed what I did NOT check rather than implying coverage I don't
have — EPBD, RE2020, RICS, London Plan, Caltrans and jurisdiction counts are named as
unverified in-section.**
**⚠️ The general lesson, which belongs in a document about buildings**: ⚠️ **§23 → `building-site-safety-commissioning-retrofit-and-why-projects-fail` lists the
Hyatt Regency pattern — a change that looks like a detail silently invalidates the
original analysis and nobody re-derives it.** **⚠️ Writing a currency section on top of
failed searches is the same failure mode in a different medium, and the fix is the same:
go back and re-derive rather than assume the earlier work holds.**
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